<!DOCTYPE html>
<html lang="zh-CN">
    <head>
        <meta charset="UTF-8" />
        <title>25_CSS3-新增边框-圆角基本使用</title>
        <style>
            div {
                width: 200px;
                height: 200px;
                background-color: aqua;

                /* border-radius: 100px; */
                /* border-radius: 50%; */

                /* border-radius: 10px 20px 30px 40px; */

                border-top-left-radius: 10px;

                border-top-right-radius: 20px;

                border-bottom-right-radius: 30px;

                border-bottom-left-radius: 40px;
            }
        </style>
    </head>
    <body>
        <div></div>
    </body>
</html>